ecu code 15 ignition output signal

car shuts off after a while running
replaced fuel filter
ignition switch
it will start after a while pump primes when key in on position then shuts off after a couple of seconds
the ignition coil was changed last year 30k ago
the wires, plugs and distributer and rotor changed sep 05

getting code 15

any help appreciated

92 integra gs 4 dr auto